[UDT] UDT with congestion control

[Harald s. <sc...@rv...>]

Hello,
i'm doing some performance tests with UDT. Without changing
any options, appclient shows 950 MB/s (1GB Ethernet, RTT about 100ms).

After i uncomment the -DCUSTOM_CC compile option in ./src/Makefile
and recompile the library the Performance goes down to 1.7 MB/s without
changing any Options in appclient.

When i change the socket options with:
UDT::setsockopt(client,0,UDT_CC,newCCCFactory<CTCP>,sizeof(CCCFactory<CTCP>));
the performance goes down to 0.2 MB/s.

UDT 2.3
Compiled with: make -e os=LINUX arch=AMD64

What may be the reason for the poor performance???

Thanks in advance,
Harald